Propeller.



Eg I. LOWE..

APROPELLER.

APPLICATION FILED NQv. I0, ISI-5.

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WITNESS/E3 EUCLID JEROME LOWE. F BALBOA, CANAL ZONE.

PROPELLER.

Specification of Letters'latent.

Patented Feb.' 2"?, 1917.

Application filed November i0, 19 15. Serial No. 60,708.

To all whom it may concern:

Be itlinown that I, llUCLID J. Lown, a

, citizen of the United States, and a resident,

of Balboa, Panama, Canal Zone, have in vented a new and ImprovedPropeller, of which the following is a full, clear and ex-v actdescription.

My invention has for a propeller aeroplanes,

its object to provide which has a flange extending forwardly of theforward edge of the proi the propeller blade being con\ peller blade,cave longitudinally and transversely, and ribs being provided at theconvex face of the blade to stillen the latter.

Another object of the invention is to provide the hub with flattenedsurfaces at each side to obtain shoulders for the base ends of theribs.' 1

Still other objects of the invention will appear in the followingspecification, in which the preferred form of my invention is described.

In the drawings similar reference charac ters refer to similar parts inall the views, in which- Figure l is a plan View of my propeller;

Fig. 2 is a front view of the propeller; and

Fig. 3 is a sectional view on the line 33 of F ig. 1. 1 l

By referring to the drawings, it will be seen that my propeller isprovided with a hub 5 and a blade or blades 6, the number of the bladeswith which the propeller is provided being immaterial` and the propellerblades are provided without pitch. At the front edge of each of thepropeller blades, there is a iange 7 which extends forwardly of theconcave face of the blade, from the hub to the outer end 8 of thepropeller blade and then along the outer edge of the blade to the rearedge 9 of the blade. Thislange extends forwardly of the blade, as hasbeen stated, and cuts directly into the medium in which the propeller isrotated, the air or other medium in which the propeller is rotated beingcompressed within the concave face of the blade, the compressed air orother medium being prevented from escaping at the outer end of the bladeby the liange 7, which extends from the front edge 8 to the rear edge 9at the blades outer edge. As there is no 'obstruction at theconcavejaceof the blade in thel rear of the forward flange 7 lthe airwhich has been compressed -alongthis concaveface of the blade is forcedrearwardly,

especially adapted forA use onwhich causes the propeller to travel in aforward'direction in a manner well understood. The propeller blade,therefore, compresses the atmosphere and drivesA thiscompressedatmosphere rearwardly Awithout reference to pitch or skin friction.While the-blades are con'caved only slightly parallel with the axis ofthe propeller, the .blades a re concaved considerably at right angles tothe axis of the propeller.

I prefer to construct my propeller of metal l and in4 order t0 make thepropeller blades rigid, I provide the convex face of each of the bladeswith stiffening ribs 10, which ex tend from the hub 5 in the directionof the outer end of the blade. I also prefer to Hatten the sides of thehub 5 at 1 1 to receive the face ends of the ribs 1'0.

y The propeller has continuous motion. The blades proper have no pitch.The flange or shoulder on each blade is subject to pitch. The faces ofthe blades against the atmosphere are concave both laterally "andlongitudinally. The blades have a shoulder or flange on their forwardedges and Yin revolving go square against thc atmosphere, which causespressure in the crown and also the same pressure against the shoulder orflange'. There is no obstruction behind this shoulder, consequently theair escapes behind as compression takes place, said action causing thepropeller to move forward. The propeller compresses the atmosphereI asit.revolves and discharges it behind. i

It should be understood that the concave surfaces of the blades strikeagainst theair, and that the ribs are on the rear or convex 4surfaces ofthe blades. l

I'without pitch, and flanges extending in the general direction ofrotation from the frontl and the outer edges of the blade.l f

3. In a propeller, a hub having a fiattened side, a blade extendingfrom'the huby at the said side, a fiange extending forwardly oftheforward edge of the'blade, and a rib on.

the blade abutting'against the said side of the hub. l

4. A prop pitch and a flange extending in the general direction ofrotation from the front of the blade.l

5. A propeller having a concave blade Without pitchpand a flangeextending in the general direction of rotation from the front edge ofthe blade.

6. A propeller having a blade concave longitudinally and transversely,anda flange extending forwardly 'from the front edge of the concave faceof the blade.

7. A propeller having a blade concave lon gitudinally and transversely,and a Harige extending forwardly from the front edge to 4the outer endof thevconcave face or' the blade.

A edge of the concave face of the blade.

9. A propeller having a blade concave transversely of the aXis of thepropeller, and

.a flange extending from the front edge to the outer end of the concaveface of the blade.

ln testimony whereof I have signed .my L

naine to this specification in the presence of two subscribingwitnesses.

EUCLD JERGME LU'VE.

`Wtnesses A Evenmin B. MARSHALL, GEORGE H. EMsLIn.

